Rename GYP and GN targets for video capture+render.
Rename GYP and GN targets for video capture+render.

This CL performs the following renames of targets to
make GYP and GN more unified and make the targets that
have the same name as the module and include the external
render/capture implementation (the internal one is only
used by WebRTC tests).
This makes it natural to declare dependencies in GN
without having to specify the target.

Summary of the renames:
GYP:
video_render_module_impl -> video_render (new target)
video_capture_module_impl -> video_capture (new target)

GN:
video_capture -> video_capture_module (now identical to the GYP target)
video_capture_impl -> video_capture

video_render -> video_render_module (now identical to the GYP target)
video_render_impl -> video_render

BUG=456815
R=andresp@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/35099004

git-svn-id: a556c8bde68cedbc0208a1ffc78b06e9cd07f676@8323 4adac7df-926f-26a2-2b94-8c16560cd09d

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